Washington (CNN)Rev. Al Sharpton said Thursday that a White House bid by Sen. Elizabeth Warren would be "electrifying."

"I think that a candidacy by Elizabeth Warren would be electrifying. I think a candidacy by a Jim Clyburn would be interesting," Sharpton told reporters at a breakfast hosted by the Christian Science Monitor. "There would be several, I'm thinking of the people with the stature and the national name recognition."

Sharpton declined again Thursday to say whether he would endorse Democratic front-runner Hillary Clinton or rival Bernie Sanders in the presidential primary. Both candidates met with him in Harlem ahead of the February 27 South Carolina primary seeking his counsel and support.

Clinton bested Sanders by nearly a 3-to-1 margin in the Palmetto State.

An effort last year to draft Warren into a White House bid fizzled after she ruled out a run, and much of that liberal energy and angst has accrued to Sanders. Warren has repeatedly declined to say who she is supporting in the Democratic primary.

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Sharpton said the reason why Clinton has not been able to pull away from Sanders in the race is because of a muddled message when it comes to Wall Street.

"I think the weaknesses of Mrs. Clinton have been she has not been able to resonate that economic message as well as Sen. Sanders. And she has not been as clear on the Wall Street greed," he said.

Sanders, meanwhile, has failed to broaden his appeal to minority voters, Sharpton said.

"The weakness of Sen. Sanders is he's not resonating with the black and Latino voters and he's got to be able to resonate with them and turn them out," he said.